Manual Inventor U5MRT32 (page 19 of 144) (English, German)

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 Page 18 

Fig. 7.3 Fig. 7.4

Oil traps

CAUTION

•

If the indoor unit is installed higher than the

outdoor unit:

An oil trap should be installed every 10m

(32.8ft) of vertical suction line riser.

(See Fig. 7.3)

-If oil flows back into the outdoor unit’s

compressor, this might cause liquid

compression or deterioration of oil return.

Oil traps in the rising gas piping can prevent

this.

CAUTION

The indoor unit is installed higher than the

outdoor unit

If the outdoor unit is installed higher than the

indoor unit:

-It is recommended that vertical suction risers

not be upsized. Proper oil return to the

compressor should be maintained with suction

gas velocity. If velocities drop below7.62m/s

(1500fpm (feet per minute)), oil return will be

decreased. An oil trap should be installed every

6m(20ft) of vertical suction line riser.

(See Fig. 7.4)

The outdoor unit is installed higher than the

indoor unit

 Page 19 

Table 7.2

Permitted length

Piping

length

Total piping length 18K+18K 30/98’ L+Max

(L1, L2)

24K+24K

30K+30K

50/164’

(farthest distance from

the line pipe branch)

15/49’ L1, L2

(farthest distance from

the line pipe branch)

10/32.8’ L1-L2

Drop

height

Drop height between

indoor and outdoor unit

20/65.6’ H1

Drop height between

two indoor units

0.5/1.6’ H2

Refrigerant Piping Connection Instructions

CAUTION

•

The branching pipe must be installed

horizontally. An angle of more than 10° may

cause malfunction.

•

DO NOT install the connecting pipe until

both indoor and outdoor units have been

installed.

•

Insulate both the gas and liquid piping to

prevent water leakage.

Step1: Cut pipes

When preparing refrigerant pipes, take extra

care to cut and flare them properly. This will

ensure efficient operation and minimize the

need for future maintenance.

Measure the distance between the indoor

and outdoor units.

Using a pipe cutter, cut the pipe a little

longer than the measured distance.

CAUTION

DO NOT deform pipe while cutting. Be extra

careful not to damage, dent, or deform the pipe

while cutting. This will drastically reduce the

heating efficiency of the unit.

1.Make sure that the pipe is cut at a perfect 90°

angle. Refer to Fig. 7.5 for examples of bad cuts

Oblique

Rough

Warped

90°

Fig. 7.5

Step 2: Remove burrs.

Burrs can affect the air-tight seal of refrigerant

piping connection. They must be completely

removed.

1. Hold the pipe at a downward angle to

prevent burrs from falling into the pipe.

2. Using a reamer or deburring tool, remove

all burrs from the cut section of the pipe.

Pipe

Reamer

Point down

Fig. 7.6

Step 3: Flare pipe ends

Proper flaring is essential to achieve an airtight

seal.

1. After removing burrs from cut pipe, seal

the ends with PVC tape to prevent foreign

materials from entering the pipe.

2. Sheath the pipe with insulating material.

3. Place flare nuts on both ends of pipe.

Make sure they are facing in the right

direction, because you can’t put them on

or change their direction after flaring. See

Fig. 7.7

Flare nut

Copper pipe

Fig. 7.7

4. Remove PVC tape from ends of pipe when

ready to perform flaring work.

5. Clamp flare form on the end of the pipe.

The end of the pipe must extend beyond

the flare form.

Flare form

Pipe

Fig. 7.8

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